Thermodynamic assessments of the Au–Gd and Au–Yb systems

Abstract

The thermodynamic assessments of the Au–Gd and Au–Yb binary systems have been carried out by the Calculation of Phase Diagram (CALPHAD) method based on the available experimental data. The Gibbs free energies of the solution phases including liquid, fcc, bcc, and hcp were described by the substitutional solution models with the Redlich–Kister equation. All the intermetallic compounds except the βAuYb phase were treated as stoichiometric phases, and the βAuYb phase was modeled using the sublattice model. The thermodynamic parameters of each phase in the Au–Gd and Au–Yb binary systems were obtained, and an agreement between the calculated results and experimental data was obtained in each binary system.